Wikipedia states Ray Hicks based on Neal Cassady

The film Who'll Stop the Rain (1978) is a psychological drama released by United Artists. The film is based on Robert Stone's novel Dog Soldiers. This film also starred Nick Nolte. Stone based the character of Ray Hicks (Nolte) on Beat writer Cassady. Stone became acquainted with Cassady through novelist Ken Kesey, a classmate of Stone's in graduate school at Stanford University. Hicks' death scene on the railroad tracks at the film's conclusion was directly based on Cassady's death along a railroad track outside of San Miguel de Allende, Mexico in 1968. [Wikepedia article on Neal Cassady]

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